Guide member for valve-operating mechanism of internal-combustion engines



Oct. 2 1923.

I C. R. SHORT GUIDE MEMBER FOR VALVE OPERATING MECHANISM OF INTERNAL COMBUSTION ENGINES Filed April 1917 INVENTOR2 CHARLES FL Snorer,

Patented @cto 2, 1923 0 warren snares intern Parent FFl 2E,

CHARLES E. @HOBT, @IF DETEIT, MICHIGAN, ASSIGNOR T0 GENERAL MOTQRS corn rear, @l? DETROIT, MICHIGAN, A CORPORATION OF NEW JERSEY.

GUIDE MERIBER JFQE, VALVEQPERATING MECHANISM OF INTERNAL-COMEUETION ENGINEE Application filed. April 6,

To all whom it may concern:

Be it known that l, CnAn'nns lit. Snow, 2. subject of the llgingot Great Britain, and resident of Detroit, Wayne County, State of Michigan, have invented certain new and useful Improvements in Guide Members for Valve-Operating Mechanism of Internal- Combustion Engines, of which the following is a specification.- I

This invention relates to hydrocarbon motors, and more particularly to improvements in guiding a resonant reciprocating member in a guide sleeve, whereby noise is prevented b any lateral movements between. the menu or and the sleeve,

In previous reciprocating valve operatmg mechanisms where a metal is member reciprocates in a metallic sleeve, an undesirable noise or clickin has been produced when there is any quic lateral movement between the member and the sleeve, such as after the clearance between these parts has been increased above the normal allowances by wear. Wherever rocking members such as cams are used for reciprocatin the valve operating members with a resu tant lateral thrust component, the dificulty experienced is considerable and very objectionable, prov ducing undesirable noises or clicks.

To bviate these and other ditliculties, and to greatly improve the construction, eiliciency and operation of a motor TECIPIOCMSQ ing valve mechanism, my invention has been provided.

The various objects will more clearly appear from the following description taken in connection with the accompanylng drawings which form a part of this specification and in. which: 0

Figure 1 is an end view, with portions 1n section, of a hydrocarbon motor power plant, embodying'preferred forms of my invention; and

Figure 2 is a longitudinal vertical section through the center of a non-metallic guide sleeve.

Referring to the drawings, 1Q illustrates a motor crank case, havin a cylinder block 11 formed thereon. A s aft 12 provided with cams 13 is adapted to be supported m bearings 14 in the crank case. Theblock is provided with a head 15 havln a port 16 which is adapted to be control ed by a poppet valve member 17. The stem 18 of nut.- Serial no. 160,128.

a sleeve 19 which is inserted through an opening 20 in the head, with its shoulder 21 resting against the upper portion thereof, A metallic bearing is shown between the lower end of the sleeve 19 and the stem 18. The upper part of the sleeve is counter bored for a short distance from its top as shown at 22 and a non-resonant bushing 23 preferably formed of fibre is adapted to be inserted between the recess portion 22 of the guide sleeve and the upper end'of the valve stem 18.

A collar 23 is secured to the upper end of the valve'stem and a spring 24 is arranged between the collar'and a disc 25 for yieldingly closing the valve member on its port seat. A rocker arm 26 is trunnioned as at 27 on the cylinder head with its curved shoe 28 in contact with the upper end of the valve stem. The opposite end 29 of the rocker arm may be adjustably connected "as by a coupling 30 to the upper end of an operating rod 31.

The lower end of the operating rod 31 is connected in any well known manner to a metallic tappet 32 mounted in a air of non-resonant bushin s 33, preferably of fibre and so ported in opposite ends of a sleeve 34 which is fitted on the crank case. The contact shoe 35 which is arranged at the lower end of the tappet is adapted to be thrust upwardly by the cam 13.

It will be noted that as the cam rotates it will tend to thrust the lower end of the tap pet member laterally as it is wardly and it will be understood that this movement will tend to gradually increase the normal clearance between the lower end of the tappet member and the bushing. If the contact were between metal and metal, it would obviously set up an annoying noise or cllck, at every reverse movement. With the non-resonant contact provided, this difficulty is entirely overcome.

Between the u per end of the valve stem and the guide, w ere there is a similar tendency to produce a lateral thrust movement, a similar device for eliminating any undesirable noise is provided.

Referring particularly to Figure 2, it will be noted that l have illustrated an entire guide sleeve 19' as illustrated at 22 pushed up in Figure l, terial, such as fibre inmead of metal as is usually the case.

I am aware that a soft fibrous material has been used as a lining for a guide for reciprocating members mounted therein to prevent the squeak which might occur when one member rubbed the other in passing. 1[ am also aware that fibre has been used to receive and partially cushion the end impact of metallic members, and I therefore do not broadly claim the use of a nonmetallic material in this respect, the essential feature of the invention being the simple and efficient means for absorbing the shock and deadening the noise peculiar and incident to the side slap where a reciprocal member is mounted in a guide and intermittently operated by a cam or other memher which tends to transmit a lateral movement to the reciprocal member whereby side stresses are set up. Y

formed of a non-resonant maneonate While l have described and will specifically claim what ll deem to be preferred embodiments of my invention, it will be obvious to those skilled in the art, that various modifications and changes may be made without departing from the spirit and scope hereof.

Havingthus described my invention, what ll claim and desire to secure by Letters Patout is:

In an internal combustion en ine, the combination with a metallic 'gui e sleeve having a stepped inner periphery, a reciprocating metallic valve member mounted therein and eriodicall'y subjected to lateral stresses, and a hard wear resisting nonmetallic bushing pressed into the stepped portion of said guide sleeve to receive the shocks due to said lateral stresses.

In testimony whereof I ailix my signature.

CHARLES R. SHORT. 

